First, let me say that I am so unbelievably happy to be back on this forum after 13 years!! Yup you read that right! This forum helped me along on all my past tanks. I’ve since rekindled my passion (and multiple tank syndrome lol) and starting a tank for me, I mean my kids

))
In the process of getting my water parameters stable for my 29g tank (photo attached!) for some Neolamp Brichardi cichlids. I have a hang on back filter with a mesh bag of aragonite. All my tests are pretty good, with the exception of
GH (in the 50-100ppm range) and
KH (in the 140-200ppm range). I used PH buffer to get me to 8.0 and that’s been holding great. Should I be adding any of these pre-made mixes by Seachem (Lake Tanganyika Buffer, Cichlid Salt, and Cichlid trace)?? I’ve never used anything like this in the past, but can’t seem to get my hardness up over the last week or so.
Any suggestions? I want to make sure my tank is optimal before they arrive!